I agree, the OP needs some counselling, but I think people's frustration (and therefore rudeness) comes from the fact that she refuses to see she has an apparent addiction, which is damaging to those around her.
As far as I'm concerned, while I have sympathy for the girlfriend, it is best for all if the husband manages to work things out with the OP.
However this is based on limited information because the OP keeps saying different things so people don't have a bad opinion (didn't mention she thinks she tricked two men into fathering children. Didn't expand on why she and her husband split)
It could be that her husband wants to get back together because he desperately misses the children, and the OP has sworn blind that she doesn't want any more kids after all, and is on the pill.
But, given her need to be given unconditional love by a baby (and once it's a few months old, wanting a new one) I think it's likely that she'll find herself pregnant again, her husband will realise she was lying and will leave, and she will be back on here again asking if 5 kids is too many to find a stepdad.
It's horrible to see someone fucking up their own - and many others - lives like this, when she won't admit she has a problem, and has admitted lying in the past.
That's why people are harsh.